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Preparation of 1-azulenyl ketones was achieved by metal-free hydration of 1-azulenylalkynes using trifluoroacetic acid as a Bronsted acid in good to excellent yields. The reaction was accomplished at a relatively low temperature with complete regioselectivity and compatibility of several functional groups.

Synthesis of 1-azulenyl ketones by Brønsted acid mediated hydration of 1-azulenylalkynes